Irish authorities are liaising with Polish officials over the source of the contamination.
Traces were found at Rangeland Foods in Co Monaghan, owned by ABP Food Group.
The Group has lost contracts with:
- Co-Operative Group
- Burger King
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The force has been charged under the Health and Safety Act and will appear before magistrates in May.
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The club's plans have provoked much criticism, with Amnesty International describing Myanmar as an 'odd choice' for a tour.